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GS2994 数据表(PDF) 11 Page - Gennum Corporation |
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GS2994 数据表(HTML) 11 Page - Gennum Corporation |
11 / 20 page GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 11 of 20 4. Detailed Description The GS2994 is a high-speed BiCMOS IC designed to equalize serial digital signals. The GS2994 can equalize 3Gb/s, HD and SD serial digital signals, and will typically equalize 140m of Belden 1694A cable at 2.97Gb/s, 220m at 1.485Gb/s and 400m at 270Mb/s. The GS2994 can be powered from a single +3.3V power supply, and is footprint compatible with the GS2974 and GS2984 equalizers. When using 1.2V CML, the GS2994 typically consumes approximately 167mW of power. 4.1 Serial Data Inputs The Serial Data signal can be connected to the input pins (SDI/SDI) in either a differential or single-ended configuration. AC-coupling of the inputs is recommended, as the SDI and SDI inputs are internally biased at approximately 1.8V. 4.2 Cable Equalization The input signal passes through a variable gain equalizing stage, whose frequency response closely matches the inverse of the cable loss characteristic. In addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length. The edge energy of the equalized signal is monitored by a detector circuit which produces an error signal corresponding to the difference between the desired edge energy and the actual edge energy. This error signal is integrated by both an internal and an external AGC filter capacitor providing a steady control voltage for the gain stage. As the frequency response of the gain stage is automatically varied by the application of negative feedback, the edge energy of the equalized signal is kept at a constant level which is representative of the original edge energy at the transmitter. The equalized signal is also DC-restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to AC-coupling. |
类似零件编号 - GS2994 |
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类似说明 - GS2994 |
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